近年來，人們環保意識抬頭，綠能產業在全世界越來越備受重視，特別是在建築方面，兼顧環保及健康照明的系統是各國所研究的重要議題，各國迫切渴望設計出能將自然光導引入室內做為室內照明使用之產品，稱為自然光照明系統，藉由將自然光引進室內作照明達到節能減碳又環保的需求。此系統可分為集光、傳光、放光三個子系統。但當能量由集光系統進入傳光系統時容易因耦合不良而導致能在大量損耗。本文設計一種高效率的光學耦合器，光學耦合器的平均耦合效率為直接耦合法的1.52倍，此結構同時具有將各Light-Brick光輸出口能量收集並往下一級傳遞的功能，不僅具有安裝容易的優勢，在大量運用的情況下更可節省許多在傳光元件上的成本花費。

Energy crisis and environmental pollution in recent years are increasing seriously, so energy-savings is the most critical issue currently faced by the globe. Especially for no pollution and has huge reserves of solar energy is of great concern by the people. We observed that during the day time, 30% of energy used as indoor lighting. In the application of healthy illumination, the industry and academics of every country design a system able to gather natural light for indoor lighting, namely, the Natural Light Illumination System. In order to reduce energy loss in light transmission, we in general want to make the optical coupler between the light collection and the light transmission. In this paper we have designed a optical coupler, which to collect sunlight for pass through the transmitter system. The optical coupler can integrate with the exits of the collectors and high transmission efficiency, most of all, the features of prism optical coupler make the coupler system easier to couple and reduce a lot of cost in transmitter.

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